Scientists studying the diets of shortfin mako sharks in the Atlantic found a bit of a surprise when they opened up a bunch of shark stomachs — nearly all of the fish the shortfin makos had eaten were missing heads and tails.

The research team, led by Sebastián Biton Porsmoguer of Aix-Marseille University in France, was investigating the diets of shortfin mako sharks in the waters between Portugal and the Azores. Though shortfin mako sharks have declined in numbers around the world and are co...